Here are the steps that you need to follow to apply the same preset to all the images in your Catalog :
1. Select All Photographs under Catalog Tab in Library module
2. Click on Edit menu - Select All
3. Select the preset under quick develop that you want to apply.
It will apply the presets on all the photographs.
Do you want to do this to all of your photos, or just the ones you have not yet edited?
In the future, you can add a Develop preset to the import process and have it applied automatically.
How do I do that?
In the import dialog, right pane, "apply during import" panel, use the "develop settings" dropdown list to pick an existing preset file.
If needed, you can create a preset by editing an image to be like you want all the new images to start as, click the "+" in the Presets panel in the Develop module.
Alternatively, you can change the default. In Develop, reset a photo so you clear any existing settings, then apply that Develop preset, and hold down Alt(PC) or Option (Mac). Notice how the Reset button changes to Set Default. Choosing this option means you won't need to apply the preset in each import.